In short: Google debuted dual-language support not too long ago, allowing users to use two languages simultaneously on the Google Home. This was a good thing for those that use two languages in their home. However, it appears that support is now broken. According to multiple users on reddit, when talking to the Google Assistant, they are only getting answers in one language. Some are noting that they'll ask questions in another language like German, and Google Assistant will answer in English. Which is a bit strange to say the least.
Background: In August, Google unveiled dual-language support for Google Assistant and Google Home. Allowing users to setup two languages on the device at the same time. So those in Canada could use Canadian French and English at the same time, or a number of other languages as well. It worked well for a little while. But about a week ago, many users started noticing that it was no longer working. This is pretty typical - unfortunately - for Google when it rolls out new features. The new features typically break pretty quickly, and it can sometimes take quite some time before Google is able to fix that feature and get it back up and running. Google has not yet responded to this issue, so it's unclear when this might be fixed.
The impact: This isn't going to be a big deal for the majority of Google Assistant users. Seeing as it is a very small percentage that is using this dual-language feature on the Google Home. But it is a bit frustrating that it is no longer working properly for those that do want to use it. For now, users will need to manually switch between different languages, if they do want to use more than one. Which can be an annoyance, but that's the way it needs to be done.